/6 AC compressor on 318

Back in the day I took a mopar knee knocker under dash A/c system off a 273 Dart and put in on my slant 6 66 Dart. I had to get the compressor brackets for the slant 6, but everything else fit. My Dart did not originally have a/c so I swapped the whole system. It was a mopar system with a mopar compressor.

So I did the backwards of the swap you want to do & it worked. Not a direct answer to your question, just a data point.